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Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
37 lines
1.5 KiB
LLVM
37 lines
1.5 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -mtriple=x86_64-apple-darwin10 -use-unknown-locations | FileCheck %s
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; The divide instruction does not have a debug location. CodeGen should
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; represent this in the debug information. This is done by setting line
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; and column to 0
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; CHECK: leal
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; CHECK-NEXT: .loc 1 0 0
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; CHECK: cltd
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; CHECK-NEXT: idivl
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; CHECK-NEXT: .loc 1 4 3
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define i32 @foo(i32 %w, i32 %x, i32 %y, i32 %z) nounwind !dbg !1 {
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entry:
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%a = add i32 %w, %x, !dbg !8
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%b = sdiv i32 %a, %y
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%c = add i32 %b, %z, !dbg !8
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ret i32 %c, !dbg !8
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}
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!12}
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!0 = !DILocalVariable(name: "x", line: 1, arg: 2, scope: !1, file: !2, type: !6)
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!1 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 1, file: !10, scope: !2, type: !4)
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!2 = !DIFile(filename: "test.c", directory: "/dir")
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "producer", isOptimized: false, emissionKind: 0, file: !10, enums: !11, retainedTypes: !11, subprograms: !9)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = distinct !DILexicalBlock(line: 1, column: 30, file: !10, scope: !1)
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!8 = !DILocation(line: 4, column: 3, scope: !7)
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!9 = !{!1}
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!10 = !DIFile(filename: "test.c", directory: "/dir")
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!11 = !{}
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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